[plan] Update documentation for JSON Schema validation approach

[github-actions]

Objective

Update any relevant documentation to reflect the consolidated JSON Schema validation approach using santhosh-tekuri/jsonschema across the entire codebase.

Context

After migrating from gojsonschema to santhosh-tekuri/jsonschema, documentation should be updated to reflect:

1. Consistent validation approach across workflow and campaign specs
2. Schema caching pattern using sync.Once
3. Removal of the unmaintained dependency

Implementation Steps

1. Check for documentation references:

   grep -r "gojsonschema\|JSON Schema" docs/ README.md DEVGUIDE.md --include="*.md"

2. Update DEVGUIDE.md (if needed):

   • Document the JSON Schema validation approach
   • Mention that we use santhosh-tekuri/jsonschema/v6 for all validation
   • Include the schema caching pattern as a best practice

3. Update code comments in validation files:

   • Add package-level documentation explaining the validation approach
   • Document the schema caching pattern

4. Consider adding to AGENTS.md (if relevant):

   • Note about consistent JSON Schema library usage
   • Schema caching pattern for future reference

Files to Check/Modify

• docs/**/*.md (if exists)
• DEVGUIDE.md
• README.md
• AGENTS.md (optional)
• pkg/campaign/validation.go (code comments)
• pkg/workflow/schema_validation.go (code comments)

Acceptance Criteria

• No outdated references to gojsonschema in documentation
• JSON Schema validation approach is documented (if needed)
• Code comments clearly explain the validation pattern
• Schema caching pattern is documented for future developers
• Documentation builds/renders correctly (if applicable)
  Related to [plan] Migrate from unmaintained gojsonschema to santhosh-tekuri/jsonschema #6401

AI generated by Plan Command for discussion #6400

[chiru0631]

Hi, I’d like to work on this issue. Could you please assign it to me?